They WERE great dogs at some point, back when they were mutts bred only to hunt. Now a lot of them are big pretty lumps of crap, because that is all they're bred to be. I'm sure there are still good ones but it's only gonna get harder and harder to find them. And even the good ones are no better than a purpose bred mutt, this isn't an insult. Purpose bred mutts are the best dogs there are. Dogos used to be one and that is when they were great.
I agree 100% and believe that applies to just about all breeds these days. When money and mass production become involved... quality goes out the door.